Injector



Jan. 14, i930. 1. P. PEDRlcK n INJEGTOR Filed Oct. 2,8. 1927 3 Sheets-Sheet l l. P. PEDRICK Jan. 14, 1930.

INJECTOR Filed o'ct. 28. 19m7 5 Sheets-Sheet 2 razze/e /DeQ/rf Arrow/frs.

l. P. PEDRICK Jan. 14, 1930.

INJECTOR Filed Oct. 28, 1927 3 Sheets-Sheet 3 Patented Jan. 14, 1930 UNITED STATES PATENT ori-ICE IBENE P. PEDBICK, 0F. PHILADELPHIA, PENNSYLVANIA, ASSIGNOB T0 WILLIAI SELLERS COMPANY, INCORPORATED, 0F PHILADELPHIA, PENNSYLVANIA, A w3- POBA'IION 0I' PENNSYLVANIA INJECTOB Application mea omver 2s, 1927. semi no. mais( My invention relates to an improvement in injectors and may be adaitedv to .injectors of various types including uplex injectors.

More particularly, my invention relates to the provision of an injector having a feed line check and overiow valve so arranged that the overflow valve will be automatically controlled through the medium of the line check. More particularly, the injector according to my invention is so arranged that when sufficient velocity of the feed Water to overcome boiler ressure is developed in the forcing tubes tiie overiow valve lwill be closed with the opening of the line check. Conversely, if the velocity of the feed water for any reason falls below that necessary to overcome boiler pressure and the line check closes, the overflow valve will be permitted to open enabling the requisite velocity of the feed water to be again' attained. Thus, 'the injector according to my invention operates to start and restart automatically on the turning on of the high pressure steam supply, or, in the case of a duplex injector, of the high and low pressure steam supplies.

Having now indicated, in a general way, the' nature and purpose of my invention, I will proceed to a detailed description of a preferred embodiment thereof. with refer- 'ence to the accompanying ,drawings in Fig. 1 is a partial sectional view of an injector embodying my invention. Fig. 2 is a fragmentary View, partly in section, of an injector similar to that shown in Fig. 1, modied in certain structuralv details. t

Fig. 3 is a sectionalrview of a line check valve.

Fig. 4 is a sectional view of an overiow valve. l

Referring more particularly to Fig. 1, a indicates a casing in which is positioned a set of forcing tubes b. The casing is provided with a steam inlet c leading to a chamber d with which communicates a steam nozzle d', which discharges into the openings f into chamber water, or of water and steam from a set of mixing tubes if the injector be a duplex.

kinto a delivery chamber 1, provided with a discharge outlet j adapted to be connected with a feed water line j to a boiler, communication between the outlet and the line 7" being controlled by a line c eck valve k.

The outlet h from the overflow chamber is adapted to be connected to a waste line It andcommunication between the outlet and waste line is controlled by a valve l. The valve l is yieldingly held on its seat by means of a coil spring m, which bears on top of the valve and a ainst a piston fn, loosely fitted in a cylindr o in a plug o threaded into the casing a, bearing against a ring p provided with an internal flange p positioned above valve Z."

Zlhe plug o is provided with a bore g adapted to afford communication between the cylinder o and the delivery chamber i.

Within the bore g extends a winged extension fr from a valve fr', which controls communication through the bore. The stem s of valve ll" extends through a gland tinto 'a cylinder u. formed in the underside of valve 1c, and is provided with a head lv.

In the operation of the device embodying my invention as illustrated in Fig. 1, it being assumed that the injector is not in operation, the line check valve k will be closed under the iniuence of boiler pressure and the overflow valve Z `will be free to.

open. If now the l'injector is put in operation Vhigh pressure steam will pass up through nozzle d into the forcing tubes b and water will enter the forcing tubes through inlet e. Initially the velocityV in the forcing tubes will be insuflicient to overcome boiler pressure, hence the line check valve c will remain closed and overiow from the forcing tubes will occur through and from thence through valve Z, which be lifted from its seat by the pressure in chamber g.

When the velocity through the forcing slightly, the inner end of gland t engagesA the head /v on stem s of valve 1 and raises valve 1 from its seat permitting part' of the water of delivery from chamber z' to pass down through bore 1' and act on piston fn, in

cylinder `o. Piston 12, is forced downwardlyunder pressure and effects the closing of the overflow valve Z through compression of spring m.. The iston n is stopped by engagement with ange p on ring p so that the spring m is not compressed more than requisite to close valve Zv against overflow pressure, in order that should the velocity in tubes b decrease and the line check close, the valve l will reopen under the pressure of the resultant overflow, without delay. When the valve 1" is closed water in thecylinder o will by-pass piston 11, as the piston is raised on the opening of valve l.

Thus it will be noted that on the starting of the injector embodying my inventionv when sufficient velocity has been developed in the forcing tubes to overcome boiler pressure andv open the line check, the overflow valve will be automatically closed. Further, it will be observed that if the feed is interrupted for any reason and the line check closes, the overflow may reopen and the feed will be automatically restarted.

Referring now to Fig. 2, in which a modification of my invention is shown, an injector is indicated at` 2, the discharge outlet from the forcing tubes being indicated at 3 and the 4overflow outlet from the forcing tubes being indicated at 4. An overflow valve 5 controls the overflow outlet and is held on its seat by means of a spring 6,- confined between' a pair of telescoping cups 7 bearing respectively on the valve 5 and beneath a piston 8. A passage 9 is provided in the bottom of the lower cup 7 for the escapeA of air or steam from between the cups. Above the'piston 8 is a chamber 10 in com# munication, through an outlet 11` and a pipe 12,with a duct 13, the upper end of which extends into theV discharge outlet 3.r The discharge outlet 3 isconnected with a boiler feed line 14 and is controlled byla line check valve 15. The`valve 15 is provided on its top with an extension forming a chamber 16 closed atthe bottom by a gland 17 through which extends the stem 18 of a valve 19 adapted to seat on the upper end of duct 13 and provided With a winged extension, or guide 20 extending into duct 13. The stem 18 is provided at its upper end, within the chamber 16, with a head 21.

As will be appreciated, the device shown in Fig. 2 operates in the same manner as that shown in Fig.' 1, in that when the line check valve 15 is closed, the overflow valve 1,74szcs4 5 will open freely, while when the line vcheckisopened -the valve 19 will be lifted 0E of its seat on the end of duct 13 through engagement of` gland 17 Vwith head 21 lon vstem 18, and pressure from the discharge outlet 3 will pass through duct 13 and pipe 12 and into chamber 10, where it will act on piston 8 .and effect the closure of overflow valve 5, through compression of its spring.

vRe erring now to-Figures 3 and 4, in which are shown an overflow valve and line check valve of modified construct-ion, in Fig. 3, the discharge outlet of an injector is indicated at 30 and a boiler feed line at 31. The discharge is controlled by a line check valve 32 yieldingly held on its seat by a spring 33. The valve 32 is formed with a central boss 34 through which extends a stem depending from a plug 35 and provided with an axial passage 36 open at one end and' in communication with laterall passages 37 adjacent its other end. The open 4 end of passage 36 is connected through a suitable pipe with the cylinder 40 of the overflow valve shown inl Fig. 4. In Fig. 4 an overflow outlet is indicated at 41 and is controlled by a valve 42 yieldingly held on its 'seat bya spring 43 confined between 'telescoping cups 44 with a cylindrical guide 45 on the valve 42 and provided with ports 46. The spring 43bearing on the valve 42 and on a piston 47 withinthe cylinder 40 withwhich the passage 36 in the boss 34 is connected as has been indicated, the structure being similar to that described in connection with Fig. 2.

The operation` of the line check valve and overflow valve of the construction shown in Figures 3 and 4 is similar to that described in connection with the devices of Figures 1 and 2, it being noted that when the line check valve 32 opens the lower end of boss 34 is raised above the lateral passages 37 permttingthe 'passage of steam from the discharge 30 into the passage 36 and hence through suitableY connections to the cylinder 40.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is 1. In an injector, in combination, a delivery chamber, a line check valve, an overflow valve, a piston operatively connected to said overflow valve, a conduit affording communication between said delivery chamber and said piston, and means controlled by said line check valve for controlling the passage of 'fluid pressure from said delivery chamber to said piston through said conduit.

2. In an injector, in combination, a de livery chamber, a line check valve, an overflow valve, a piston, a spring confined between the overflow valve and the piston and adapted t0 yieldingly hold said overflow Adelivery valve on its seat, a conduit affording communication between Lthe delivery chamber and the piston, a valve controlling the passage of fluid pressure through said conduit and means affording an `operative connection between said valve and said line check valve, whereby when said line check valve is opened fluid pressure will act on said piston and effect the closing of said overflow valve through compression of its spring and when said line check valve is closed fluid pressure will be shut off from said piston and said overflow Will be free to open.

3. In an injector, an overflow valve, a feed line check valve, and means rendered `operative by opening of the check valve when the delivery pressure exceeds boiler pressure t0 close the overflow valve.

4. In an injector, a overflow valve, a feed line check valve, and means rendered operative by opening of the check valve when the pressure exceeds boiler pressure to maintain closed the overflow valve.

5. In an injector, an overflow valve, a feed line check valve, and means rendered operative by opening of the check valve when the delivery pressure exceeds boiler pressure to close the overflow valve, said check valve having an initial opening movement prior to actuation of the flow valve.

6. In an injector, a delivery chamber, an overflow valve. a feed line check valve, and means actuated by fluid pressure in the delivery chamber and rendered operative by means for closing the overopening of the check valve to close the over- `overflow valve, a feed line flow valve.

7. In an injector, a delivery chamber, an check valve, and means actuated by fluid pressure in the delivery chamber and rendered operative by opening of the check valve to maintain closed the overflow valve.

8. In au injector, an overflow valve, a feed line check valve, means rendered operative by opening of the check valve to apply a closing force to close the overflow valve, and means limiting theI closing force applied to the overflow valve.

9. In an injector, ain overflow valve, a feed lille check valve, means rendered operative by opening of the check valve to apply a closing force to maintain closed the overflow valve, and means limiting the closing force applied to the overflow' valve.

10. In an injector, an overflow valve, a feed line check valve. fluid pressure operated means for closing the overflow valve, and means rendered operative by opening of the check valve to effect operation of said means by pressure of delivered fluid to close the overflow-valve.

11. In an injector, an overflow valve, a feed line check valve, fluid pressure operated means for maintaining closed the overflow valve, and means rendered operative by opening of the check valve to effect operation of said means by pressure of delivered fluid to maintain closed the overflow valve.

In testimon hereunto set Penns 1927.

y of which` invention, I have my hand, at Philadelphia,

onv this 20th, day of October,

IRENE P. PEDRICK. 

